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Opdyke CDP, Illinois

Official LSAD Designation: Opdyke CDP • Census GEOID: 1756198 • Jefferson County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Opdyke CDP.

Reference Weather Station: MT VERNON 3 NE, IL US (ID: USC00115943) • Located 7.1 miles from community center • Elevation: 149.4 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 38.5° 21.7° 30.1° 2.60"
February 43.6° 25.0° 34.3° 2.62"
March 53.6° 33.8° 43.7° 4.00"
April 64.9° 44.1° 54.5° 4.96"
May 73.8° 55.0° 64.4° 5.06"
June 82.4° 63.7° 73.1° 4.84"
July 85.7° 67.3° 76.5° 3.78"
August 84.8° 64.8° 74.8° 3.33"
September 78.6° 56.7° 67.7° 3.37"
October 67.5° 44.7° 56.1° 3.53"
November 53.7° 34.2° 44.0° 3.99"
December 42.9° 26.1° 34.5° 2.89"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station MT VERNON 3 NE, IL US (ID: USC00115943) • 7.1 miles from community center .

This is the same reference station used for monthly normals.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at MT VERNON 3 NE, IL US Year is the horizontal axis. Annual mean temperature in degrees Fahrenheit is the vertical axis. Dots show recorded years; lines connect consecutive available years only. Missing years are gaps, with no interpolation. Optional dashed lines show annual mean of daily highs and lows. Exact values appear in the data table below. 40.0 48.0 56.0 64.0 72.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2011: Annual mean 54.6°F 2013: Annual mean 52.8°F 2015: Annual mean 54.2°F 2017: Annual mean 56.9°F 2018: Annual mean 55.3°F 2020: Annual mean 55.5°F 2023: Annual mean 57.1°F 2010: Annual mean of daily highs 64.7°F 2011: Annual mean of daily highs 64.2°F 2013: Annual mean of daily highs 62.4°F 2015: Annual mean of daily highs 64.0°F 2017: Annual mean of daily highs 68.5°F 2018: Annual mean of daily highs 66.2°F 2020: Annual mean of daily highs 66.5°F 2023: Annual mean of daily highs 69.0°F 2011: Annual mean of daily lows 45.0°F 2013: Annual mean of daily lows 43.2°F 2015: Annual mean of daily lows 44.5°F 2017: Annual mean of daily lows 45.2°F 2018: Annual mean of daily lows 44.4°F 2020: Annual mean of daily lows 44.5°F 2023: Annual mean of daily lows 45.3°F

Source: NOAA NCEI Global Summary of the Year.

Annual temperature data table (°F)
Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year Annual mean (°F) Annual mean of daily highs (°F) Annual mean of daily lows (°F)
2010 Unavailable 64.7 Unavailable
2011 54.6 64.2 45.0
2012 Unavailable Unavailable Unavailable
2013 52.8 62.4 43.2
2014 Unavailable Unavailable Unavailable
2015 54.2 64.0 44.5
2016 Unavailable Unavailable Unavailable
2017 56.9 68.5 45.2
2018 55.3 66.2 44.4
2019 Unavailable Unavailable Unavailable
2020 55.5 66.5 44.5
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 57.1 69.0 45.3
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.